/**
 * Formats a number with comma separators.
 * @example formatNumber(1234567) will return '1,234,567'
 * @example formatNumber(1234567.89) will return '1,234,567.89'
 */
export const formatNumber = (num: number | string) => {
  if (!num) { return num }
  const parts = num.toString().split('.')
  parts[0] = parts[0].replace(/\B(?=(\d{3})+(?!\d))/g, ',')
  return parts.join('.')
}

/**
 * Format file size into standard string format.
 * @param fileSize file size (Byte)
 * @example formatFileSize(1024) will return '1.00KB'
 * @example formatFileSize(1024 * 1024) will return '1.00MB'
 */
export const formatFileSize = (fileSize: number) => {
  if (!fileSize) { return fileSize }
  const units = ['', 'K', 'M', 'G', 'T', 'P']
  let index = 0
  while (fileSize >= 1024 && index < units.length) {
    fileSize = fileSize / 1024
    index++
  }
  return `${fileSize.toFixed(2)}${units[index]}B`
}

/**
 * Format time into standard string format.
 * @example formatTime(60) will return '1.00 min'
 * @example formatTime(60 * 60) will return '1.00 h'
 */
export const formatTime = (seconds: number) => {
  if (!seconds) { return seconds }
  const units = ['sec', 'min', 'h']
  let index = 0
  while (seconds >= 60 && index < units.length) {
    seconds = seconds / 60
    index++
  }
  return `${seconds.toFixed(2)} ${units[index]}`
}

export const downloadFile = ({ data, fileName }: { data: Blob, fileName: string }) => {
  const url = window.URL.createObjectURL(data)
  const a = document.createElement('a')
  a.href = url
  a.download = fileName
  document.body.appendChild(a)
  a.click()
  a.remove()
  window.URL.revokeObjectURL(url)
}
